IMO, 8th mix was a nice change over 7th mix. The rolls are much trickier and emphasizes more on technique, unlike 7th which is all brute force and stamina, hell, you could full combo all the new song ...
They got lazy or they're cost cutting. i also think 'retouching' the banners and translation will increase the production cost for asian versions... probably why i still havent heard of a korean PF6. ...